On Mon, 06 Mar 2017 21:19:55 +0100, Emanuel Berg
wrote:

Hello again everyone!

Now I've moved on from the Swedish and
Norwegian standard bikes of the 70s into the
most recent of bike technology, namely the
mountain-bike or "MTB"!

I read on the cassette that you should pull it
40 nm. There is even an arrow pointing the way.
It is the well-known way, but OK.

I know there is a tool for this - torque
wrench, right?

I don't have one, but I do have the everyday
half-inch ratchet, and the special socket with
all the teeth (?) -
of 40 nm, I know only this is a lot and the
reason I know this is every time I remove it, it
is stuck like, very firmly!

When I pull, I hear a crash sound three or
four times. This seems to be normal.

I asked the local guru who did bikes since the
80s. He also claimed he was a master after only
two years. Anyway he suggested it was sand!
But I'm not that stupid I don't make the parts
rudimentary clean before I operate them. So it
is not sand. Besides the sound is much to big
to be sand.

Anyway what do you guys make of all this?

The inner surface of the flange on the retaining nut is serrated and
the outside surface of the small cassette cog is also serrated and the
noise you hear is the serrations scrapping over each other. The
separations serve to act as a locking method for the retaining nut.
--
Cheers,

John B.